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Finding the Fourth Proportional to 907.65, 1,367.53 and 821.08

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Solution

The fourth proportional to 907.65, 1,367.53 and 821.08 is: 1,237.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.65 : 1,367.53 = 821.08 : x
  2. Step 2: Convert to fraction form
    907.65/1,367.53 = 821.08/x
  3. Step 3: Cross multiply
    907.65x = 1,367.53 × 821.08
  4. Step 4: Simplify right side
    907.65x = 1,122,851.53
  5. Step 5: Solve for x
    x = 1,122,851.53/907.65
  6. Step 6: Final answer
    x = 1,237.10

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.